Aseismic Analysis Of The Liquid Filling Pipe In The Water Cooling System Of The Converter Valve

The seismic performance of the water cooling system of the converter valve is related to whether the converter valve can work continuously and safely when the earthquake occurs.Therefore,research on the seismic performance of the water cooling system of the converter valve has high practical significance.In this paper,trigonometric series method is used to synthesize artificial seismic waves.Spectral analysis method and time-history analysis method are used to study the seismic response characteristics of the liquid-filled pipeline of converter valve water cooling system.The main research contents and conclusions are as follows:(1)Taking the 8 degree seismic fortification intensity of a converter station as an example,the artificial seismic wave is synthesized by the triangular series method.The slow convergence rate,the non-convergence point and the zero line drift during the process of seismic wave construction are studied.And other issues.(2)A three-dimensional finite element model of the liquid-filled pipe of the water-cooling system of the converter valve was established.The seismic spectrum response characteristics of the liquid-filled pipe of the water-cooling system of the converter valve were analyzed using the finite element method.The results show that the natural frequency of the fluid-filled pipe of the water-cooling system of the converter valve is generally low,and the vibration modes of the order 1,3,and 5 are represented by the torsion of the flanges on both sides,2,4,6,7,8,and 9,The tenth vibration mode is represented by the oscillation of the pipeline;when the pipeline is not filled with liquid,the frequency in the middle of the pipeline reaches the maximum when the frequency is 0.0184Hz,and the displacement on both sides of the pipeline reaches a maximum;when the pipeline is filled with liquid,the frequency is 0.0088Hz,the middle of the pipeline The stress reaches the maximum and the displacements on both sides of the pipeline reach the maximum;the maximum stress of the pipeline when filled with liquid is increased by 54%compared with the time when the liquid is not filled,and the maximum displacement is increased by 58%compared to when the liquid is not filled.(3)Time-history analysis method was used to analyze the seismic response of the water-cooled system of the converter valve when it was filled and unfilled.According to the displacement,stress response curve and calculation results,the maximum stress occurred at the contact point between the pipe and the hoop at 12.2 s.When the liquid was filled,the stress on the pipe was 61.1%higher than that of the unfilled pipe,and did not exceed the material.Permissible stress;the maximum displacement of the pipe structure occurs at the joint between the pipe and the flanges on both sides.The maximum displacement during filling is 69.8%higher than when the liquid is not filled.The flow velocity in the pipe is a tortuous change under the maximum seismic response.The axial radial deformation of the pipe.